.node {
            cursor: pointer;
        }
        
        .node circle {
            fill: #fff;
            stroke: steelblue;
            stroke-width: 1.5px;
        }
        
        .node text {
            font: 12px sans-serif;
        }
        
        .link {
            fill: none;
            opacity: 1;
            stroke: #ccc;
        }